Update clang to r339409b.

Change-Id: Ied8a188bb072c40035320acedc86164b66d920af
diff --git a/linux-x64/clang/include/llvm/Transforms/Instrumentation.h b/linux-x64/clang/include/llvm/Transforms/Instrumentation.h
index 4a346c8..d6d9529 100644
--- a/linux-x64/clang/include/llvm/Transforms/Instrumentation.h
+++ b/linux-x64/clang/include/llvm/Transforms/Instrumentation.h
@@ -111,6 +111,9 @@
   // Do counter register promotion
   bool DoCounterPromotion = false;
 
+  // Use atomic profile counter increments.
+  bool Atomic = false;
+
   // Name of the profile file to use as output
   std::string InstrProfileOutput;
 
@@ -131,7 +134,8 @@
 
 // Insert MemorySanitizer instrumentation (detection of uninitialized reads)
 FunctionPass *createMemorySanitizerPass(int TrackOrigins = 0,
-                                        bool Recover = false);
+                                        bool Recover = false,
+                                        bool EnableKmsan = false);
 
 FunctionPass *createHWAddressSanitizerPass(bool CompileKernel = false,
                                            bool Recover = false);